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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295c619febd5384d5e81e1b0ef4662dbecf3e21561f19f14c775f53ba464a613' 
  AND token = 'jwiJmsf66MSo8rpzzX1CjBsMBb9bQqKmTVu8kB4Ncuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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