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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18314c555ae3347786a45222dafc5c021a4eacb732a04652c7f779e618c63c08' 
  AND token = 'WXEwLM60CPN4izsBcm6ZUJ+uPKVeUCAMLbH2IOfpHpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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