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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bffa15b9990d50e8d71a450d892b9f3d039d5effc4fe9eacbae7dafb0aea143' 
  AND token = 'eCaRu/VX6VrZQSzyJcOEHyFLi8sF/CKnhGyeu8aTmvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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