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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737128f714403eaf690e55c68dbfe05357d3fe9f1ea256dcb2e9555208e5fc8c' 
  AND token = 'jIanbDYtwK//d6CYU1v2TkhkUf7BG55K7fj/I8t8Bzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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