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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c52b88e284bea3f784e5ab27724c92f487b0c3c7be02ac8fc9a8d8c2ebb27b' 
  AND token = 'TBqVgA95kOa29FF+LEMhqF2Ae4XDF3bPuEPz0Pr/lwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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