SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25645ac8f6d73588b596f829ec89381102d7b09b460f4fb4d82ce0f206fc66c7' 
  AND token = 'x4NhU+elBm+kHKs6BH/qTgAvnJCoXKh7RYCFgjzusWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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