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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f36c8532bf5bb0274c12f6e2db8062e74443c5ede22fe19444f32a6ae28a6509' 
  AND token = 'Apnd5YfmsZjCqAE2LAawJPhcBzeZ3toblaor14BHeCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}