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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1a45097a8d3faec1ac1c9a8194d2f7d26035a41619a00eaa66f8d1e08fc86d' 
  AND token = '/mUVTHkglzRnst80KUlOKY65K1AQhaGS/22sBjGbgdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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