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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d4f9a2bb508c4cfe9f3164e05d1a56e9c93db3051a5afc54f422ca3502bd57' 
  AND token = 'LJk1U2YV442QcA5u0YeyoRZ46MBySrK19eApfnls8yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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