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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e281504e13b51a01e3ffc8cb691fa451ad04ddde87c1bc0a498da0dde1118b' 
  AND token = 'umJjj0GH9M5pObfrbWikOKgCIw7JA4WeJ/otJ4fSSmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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