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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeae42294d7455a396c94a8cb693c85f9eae8ba82509036340f5f22b52021e25' 
  AND token = 'itpEP7Yd0awmnCIKWALGplA7a5e3n6cy3niw7AqUWX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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