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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f656f73552a3494cbd69c2113634064e2f6b994ece0c2154b5548091127c4f' 
  AND token = 'Qp9uDyuAS6vzZgW+5j0vIJjoiZ2Mv0z0sPjF6938gxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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