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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae11749c9b4ba2107885d3cdcf22b4684758922f9c57e8d91a602b4bdcab7ca' 
  AND token = 'K1CpJTWy94tnvh7Xgg9Ly3L7rhT36fOrDS69HBvWES4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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