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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57308a00c54ef659882054bd86384da3da7931381799bf1ebec61448030274e7' 
  AND token = 'zZ1sct/MOVIRHxr6H7al8wJVIp6K2Rynqm3QM6j1Hc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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