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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98967c19c3f4febf5d5cbdd46de9161ebbe61914b7047f247f826c72e244fac' 
  AND token = '0YYBblO+YifyJdsiRje5QJgbn5wKj7BYoPv9DolBi+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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