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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1bfc13c11f9748c3679cce464b3f9c1ecff650e58203294eb88913ef0d2b78' 
  AND token = '8OaacMdlZpx4gKzXKAiwRuLFNZ5OR5gj3KUDud4t4YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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