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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda32f9c3ef5ab01240fee1679d20ea1704ae5fe2357ff6f7e94f2b919a7154d' 
  AND token = 'W36Lyk/qnYQ2PppAHuoOJpe61tQ2Pqa3efmIqP99KnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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