SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1fe3a6a66f1087981bc2d3a5beeb99c966973fcb7bc83631745df2d2531f84' 
  AND token = 'rPmD31SLbHuo1vLJn4XGpxiEcwhD+93neVX1j4ggBcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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