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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0826790ff1e6f432107f1f0c550aadd6e743203149dcde385a4f2ff67b75ab25' 
  AND token = 'aJrxiQbVCMse5uCCbF6/J0+qWpjJAss2DdkXc803VWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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