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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4ec305e0996486a8c28aed98d54b8fc2498ab0503138dafaaa8e6419f87cc0' 
  AND token = 'mrK2+NNMhO8rlvtEpO7ejENxqGHZdP2HuRO0uRHvSEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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