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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11069fdd4103b1f5c48765624dd4473a800b30ab61c5dd5c0a321aa4abf3e83f' 
  AND token = 'vo6KPdU/RXw3X6JWrRpBp4GaHyFf+FlMRUzy5rQaHJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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