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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a07169d37681d879ed8cf9f6fcba93e808815a3da39c29d1509cb7bf76acbbb' 
  AND token = 'mmpSUqZ9dfDfEO/6wtCKMpimXsocshVNxX8o+21AhwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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