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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409d2c28f48aba449b4e04652bdc24d28a2344162fad0fda5b62b2e9056f824d' 
  AND token = 'S7G3jplmA/CuYZlmQvgLafudT/PPI7ZLqWl8G1Uuurk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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