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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50bc7852c1f00f05156accfddd7d29dd19010bed17d9af57a934b0253702fd9' 
  AND token = 'RLMXTrOFQNfzfQr8s0EUon++GUquf/iDns4F9+EBrqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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