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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4af8ffd8bed578744a09b1209c7e3543aa213083d7421a487c2fe5f8cbaf107' 
  AND token = 'Ls8p09sbe09OhuHPMiSRU2tS6XsKBSW4Mumu5Va3YFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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