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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015723ffd12fbadcb6a5da4788f1efe285b425f3c6e829aa979be110945e1f6d' 
  AND token = 'GRD0H8OGkCi4VU5LJlEXni3IYVB6B9m0euH/CTPRNpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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