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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03076638016142cf177d9f4bf72080b69e7296d3b10d394ed9d67a28f26f05e0' 
  AND token = '9ZyPkUKlM2WYiAscqYd5UXJJ/8VX2ZUsdnQ9Zpros2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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