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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcd22b265f5aebaa235a8af61b3d36ef76dc4167bdfa538e2ff1415b5adf065' 
  AND token = '2ui8Lc1pxJ//vc61DwSQBYJAQ3HzMkrrGu4mrCf00lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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