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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e1c0cc6dcb978353340d32583de73e529ab578b4d16b45e910253207144484' 
  AND token = '2ccIt1pMRXu0NFV6BBDWFrPoKWC58v5wTzpyf4iJf8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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