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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981dde8950b7fd1188e1ce25aedb0e4f9b127bb5f03a7eb3a9db8903e94b0f81' 
  AND token = 'hJUOYaJU2SWsw2O3kDoijPGOxNsrzNzZuP6bMB0Cgbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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