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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eecd3b1deae7c53b8f90a5c3d23905cced3d7df40bce2feec88fe633c2b97d' 
  AND token = '4i22hfM1TK0qUYy7g80bS7rw/SqoSFbwZIwbLcHCJJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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