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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b59009239c0ac0977862410de1b06e1a8b099572c6d13abc54480cf152a5382' 
  AND token = 'c1pIJS2+Nfu48zSNepQAkOzbIsqy56MTB4marsov08g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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