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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c569915885b18ea455399b4681761feee8a1cfdfcd1cb04bb268ed7a3ed027' 
  AND token = 'RpyRlv9rekHyOVyKwx4Boo6k8NHcFc/3OUa+gjbYE9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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