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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599a0b27326b9a38f19b29b1bb5e04fb2f2e82a5effcdbd46dd6afb71712899f' 
  AND token = '5obK2Yk++op6KCQzoeHdJ8d0ZtwkSxIaiWe3YVQCzg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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