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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05009a4ac230ef886e25475944ba20d4b344860d9be0f29bcbf39dd5af263ea' 
  AND token = 'EAvbkh9yC+KV6GV8yknOYIslpd23nD3sxf5/0XnRrHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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