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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0eda245f1f85177e9409ba0ffc4b8aa1b60d623b2ea2e522e5b7c828bbc4c4f1' 
  AND token = 'WUReFdx4urjOtOmzDZilJMnxUP2CHzEsKeVmCgyOMlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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