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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4935b878de10bf7d329b636176ee062c8e9563169b3a93d42d693818b2d80424' 
  AND token = 'JBxy9jkQJm1Zu73XvIqbMHxRHKjoISpaNuN7xbUppic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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