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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34940cbc66635972dff27a44fe7c5fbf76d3b255b0c707e5ede1df358da29500' 
  AND token = 'cWL1iSFoZogcdLtMTdXFpR7ekoGrjMbyoEl8qp6z2sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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