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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8315dfd6aeea9e4aaf769be8b59aaf0ca52fb003aac1a6e0d31753c1d6f46eb7' 
  AND token = 'biyT4QDJUdoT7p2DRNQM1ZTps/bEH3Pt3QuC7xLxiY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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