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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbcc92cbd4f617c3a018322885e02e2a57c5306a03a5aa524a3a4fba32ed650' 
  AND token = 'a8IokLH0XyIRI6Q0+hH7fvLNfWGr27g6IFIJwt6X2S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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