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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcc3da18f54e7e2782778973f2120710cdf96cdc936845f3ba1ed8326c060cd' 
  AND token = 'UW0/Ag7V3kuEkNprEVUcCJbJPa76b35BaxtNKWXplf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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