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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab5f65f06bbeaf581a70b74f688b1036bd46454149a8e0bb4d28af2a4a6683c' 
  AND token = 'ufdrr/Cj7e7ucaB1jVE5Yzj7WwofTi/g5Cm46UIVO4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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