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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92a1354112f92e2eca101cb42ab24ee8d5131dd2d39c1a83901df1988d5315e' 
  AND token = 'v38jarmrLEs3+cabKYl5wJctbaZk0pkHYl/u2/qp26s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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