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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b2aed289860a038d07a1b24959db230dddd602c639f53a4b0d75b7cd635751' 
  AND token = 'yi1QN3FQnUxzU3GazXwLyK5W9Yzq14qh8JuSw8sf448=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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