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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801ed17565d70b342299c5e1e70269c8128974049d0e7370308731bc527a964b' 
  AND token = '0TJ/1kg7O4AakWJ9SyMUDIjGAVscRp+eEmpim3pKWcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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