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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a09007f48814e245e3b84143fe5a131c5f715107279aaf8e438353186fc13a2' 
  AND token = 'aSjbXsy2MAmEvKuvfW283CZ8452zF4Fz5S3peR/efuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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