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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03ad04886ca771b8e785bb0b9e1d344c6e8bd2b86e80da3aa104b92fef884ae' 
  AND token = '4M2pv1g1EXwWQ4sZLSviM+DM9+XB84a3t1gOyA7lqP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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