SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1341bab4d8fdfd56121ab1158ba7ffd9a817ed4a137e7c966a077ab7928fbe9' 
  AND token = 'WGtEoLV2bRQNpqIPW+Imps4zVyBwKSYlPAuUv6gAJTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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