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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e25d5c6d1513fdd3a8083d68f6f68b0d530976b89fa949cb5f76b51c634996' 
  AND token = 'qJmLOuyIjaDjDB9A7r9Rsbb6Qeu5vIjb07TAYqfagRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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