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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f90d0d388cf519ed499c2d42ebfb3359c3787c14e317b6b4d5d6dd6d6512e31' 
  AND token = 'Lw7RF/i+9O2hepP7Z+AHC2x6WH1VLLKDJOhFna0BENA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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