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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88132a215b4e314d93734185aaf64d073e19bdc708d30691b731ab9cac24cbf3' 
  AND token = 'xr4Bqm/VTksM+45nc6D7c/D65ZaVsbL2H02mN5tC8NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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