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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98486291ca4e7c57aca4b6be7c06e57e972ee3084fcabe7332ec96d747cc123' 
  AND token = 'khmz/l2u+uMdi7DTez6Bx/8xs8DeNF83xjz3+ZKPXZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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