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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84ab0d2ed328a18e0bd5e9be4c2ef3459021adeae49f7144160790f6fe098fe' 
  AND token = 'pHEOUHrTFEUdZ2ulU5+u3P0n2Fm9/1B/EWh2e7VVJew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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